So I have been paying more attention to this in the Lodge I attend since we are only allowed to conduct business at the MM level.
For an example lets say we are going to do the 1st degree. We open on MM send out the guide, close the MM, open on the EA, perform the 1st degree, then the WM says anyone who are not MM please retire or something along those lines, we then close at the EA level, open back on the MM level, do any business at the MM level then fully close and then go out to have coffee and whatever refreshments were brought.
I think I might ask the question why so much switching back and forth because it seems kind of silly to open on the MM level just to close the MM level to go down to whatever degree we are going to do. It makes me wonder if it's one of those that's how it's always been things or I'm thinking probably one of the things passed down from Grand Lodge.